Canon EF 70-300mm f/4-5.6 USM L IS - APS-C Format Review / Lab Test
Lens Reviews - Canon EOS (APS-C)
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Review by Klaus Schroiff, published December 2010


We've just tested the Canon EF 70-300mm f/4-5.6 USM L IS within its native full format scope so you may forgive us that we've pretty much copied the introduction.

The Canon EF 70-300mm f/4-5.6 USM L IS is the latest addition to their tele zoom lens lineup making it, by far, the most extensive system in this segment. The EF 70-300mm USM L IS is the top-of-the-line L-class ("Luxury") model here thus a professional grade product at a professional grade price (~1500EUR/US$). You can, of course, use this full format lens on an APS-C DSLR where its field-of-view is equivalent to "112-480mm" (full format). During the film era this would have been a quite extreme range.

The build quality of the lens is nothing short of outstanding - that's probably the very first time for me to praise a ~300mm zoom lens like this. The lens body is made of metal and everything is tightly assembled and also sealed against dust and humidity. The inner lens tube (also made of metal) extends when zooming towards the long end but there's not even the slightest hint of wobbling here. The focus ring operates silky and the zoom ring feels very smooth as well. There's a transport lock (70mm setting) in order to prevent zoom creeping but our sample showed no tendency to do so anyway. The front element does not rotate during focus operations so using a polarizer remains easily possible. The lens does not feature a dedicated tripod mount straight from the factory but it is an optional accessory.

The ring-type USM AF is blazingly fast and near silent. FTM, full-time manual focusing, is possible in one-shot AF mode. LiveView-(contrast)-AF is reasonably fast. The AF accuracy of our test sample was very high. Just like most Canon tele lenses it features an image stabilizer (IS) which is supposed to give you an extra potential of up to 4 f-stops. You should take such specs always with a little grain of salt but it seems to come quite close actually. Unlike the consumer variants the IS system has 2 modes - a normal one for static shooting (horizontal + vertical stabilization) and a panning mode (horizontal OR vertical stabilization - the panning direction is automatically detected). The IS also supports tripod detection so it can remain activated here.

Here's a comparison with its nearest cousins:

EF 70-300mm f/4.5-5.6
EF 70-300mm f/4-5.6
EF 70-300mm f/4-5.6
design: 18 elements in 12 groups, 1x DO element 15 elements in 10 groups, 1x UD element 19 elements in 14 groups, 2x UD elements, floating system
size: 82x100mm 77x143mm 89x143mm
weight: 720g 630g 1050g
image stabilizer efficiency: 3 f-stops, 2 modes 3 f-stops, 2 modes 4 f-stops, 2 modes
aperture blades: 6 8 8 (circular)
min. focus: 1.4m 1.5m 1.2m
filter size: 58mm 58mm 67mm
AF motor ring-type USM with FTM and non-rotating front element micro-USM, no FTM, rotating front element ring-type USM with FTM and non-rotating front element
sealing no no yes
approx price tag: 1200 EUR/US$ 450 EUR/US$ 1500 EUR/US$

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